Behind the wheel of a Chevy Silverado, a one-hundred-pound woman can generate more than six hundred horsepower as she draws a six-ton trailer at sixty miles an hour while talking on the phone and drinking coffee, in gym clothes on a frigid winter day. Prior to the Petrocene Age, only a king or a pharaoh could have summoned such power, and its equivalent would have required hundreds of enslaved people and draft animals.
